In the 2015 Paris Agreement, most countries agreed to try hard to limit global warming to below 1.5 degrees Celsius. Delay and inaction mean that goal is becoming harder to achieve by the day.

"Some may seek to deny or delay the clean energy revolution that's underway in America, but nobody — nobody — can reverse it," Biden said. But Trump has vowed to roll back those plans.

Peatlands, formed by ancient wetlands, store more carbon than the world's forests. But when they're drained for farming, they vent heat-trapping carbon dioxide into the air.

The kitten, which was found in Russia's northeastern Sakha Republic, still had fur and whiskers when it was discovered.

Scientists are reconsidering old information about Uranus. NPR's Scott Simon explains the problem with photos taken of the planet 38 years ago.

The group Animals Lebanon says it rescued Sara the lion cub from abuse by a Lebanese social media influencer, kept it safe in Beirut and sent it to a wildlife sanctuary in South Africa.

Scientists say the pocket gophers were cranky about being moved into a devastated landscape for a day in 1980. But decades later, their short visit still has visible, and vibrant, effects.

The next supermoon — which appears larger and brighter than a regular full moon due to its proximity to Earth — will not be visible for nearly a year.

Fossil fuel emissions have increased steadily for almost two centuries. Now, the world may soon reach an important turning point for climate change.

A similar hearing last year brought extraordinary moments, including a retired intelligence officer alleging that the U.S. government has recovered nonhuman "biologics" from crash sites.